diff --git a/guix/build-system/glib-or-gtk.scm b/guix/build-system/glib-or-gtk.scm
index 039bfb948c..8091311879 100644
--- a/guix/build-system/glib-or-gtk.scm
+++ b/guix/build-system/glib-or-gtk.scm
@@ -122,7 +122,7 @@ (define* (glib-or-gtk-build store name inputs
                                                   "bin" "sbin"))
                             (phases '(@ (guix build glib-or-gtk-build-system)
                                         %standard-phases))
-                            (glib-or-gtk-wrap-excluded-outputs '())
+                            (glib-or-gtk-wrap-excluded-outputs ''())
                             (system (%current-system))
                             (imported-modules %default-imported-modules)
                             (modules %default-modules)